Distance measurements in Au nanoparticles functionalized with nitroxide radicals and Gd super(3+)-DTPA chelate complexes

Nanosized gold particles were functionalised with two types of paramagnetic surface tags, one having a nitroxide radical and the other one carrying a DTPA complex loaded with Gd super(3+). Selective measurements of nitroxide-nitroxide, Gd super(3+)-nitroxide and Gd super(3+)-Gd super(3+) distances w...

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Published inPhysical chemistry chemical physics : PCCP Vol. 14; no. 30; pp. 10732 - 10746
Main Authors Yulikov, Maxim, Lueders, Petra, Farooq Warsi, Muhammad, Chechik, Victor, Jeschke, Gunnar
Format Journal Article
LanguageEnglish
Published 01.07.2012
Subjects
Approximation
Deer
Gold
Mathematical analysis
Nanoparticles
Radicals
Systematic errors
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Summary:Nanosized gold particles were functionalised with two types of paramagnetic surface tags, one having a nitroxide radical and the other one carrying a DTPA complex loaded with Gd super(3+). Selective measurements of nitroxide-nitroxide, Gd super(3+)-nitroxide and Gd super(3+)-Gd super(3+) distances were performed on this system and information on the distance distribution in the three types of spin pairs was obtained. A numerical analysis of the dipolar frequency distributions is presented for Gd super(3+) centres with moderate magnitudes of zero-field splitting, in the range of detection frequencies and resonance fields where the high-field approximation is only roughly valid. The dipolar frequency analysis confirms the applicability of DEER for distance measurements in such complexes and gives an estimate for the magnitudes of possible systematic errors due to the non-ideality of the measurement of the dipole-dipole interaction.
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ISSN:1463-9076
1463-9084
DOI:10.1039/c2cp40282c